Crossword Genius

Upset odds badly (5)

Ross

I believe the answer is:

spill

'upset' is the definition.
(thesaurus)

'odds badly' is the wordplay.
'odds' becomes 'sp' (betting abbreviation for starting price).
'badly' becomes 'ill' ('ill' can be adverbial as in 'ill-advised').
'sp'+'ill'='SPILL'

(Other definitions for spill that I've seen before include "Upset - lighter" , "Accidentally cause to overflow" , "Tip" , "Allow to drop - fire lighter" , "Shed" .)

I've seen this clue in The Independent.
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